Soap bar



FIG. 1 is a perspective view of a soap bar, showing my new design;

FIG. 2 is an enlarged left side view thereof;

FIG. 3 is an enlarged rear view thereof;

FIG. 4 is an enlarged front view thereof;

FIG. 5 is an enlarged right side view thereof. 

The ornamental design for a soap bar, as shown and described. 